Octopus not SVG

index.html

<div class=container>
  
  <ol class='in items'>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
    <li>Item</li>
  </ol>
  
  
  <div class=head>
    Lorem Ipsum
  </div>

  
</div>

octopus-not-svg.markdown

Octopus not SVG

A Pen by Chris How on CodePen.

License.

script.js

const itemLists = document.querySelectorAll('.items');

itemLists.forEach((itemList) => {
  const items = itemList.querySelectorAll(':scope > li');
  const numItems = items.length;
  itemList.style.setProperty('--itemCount', numItems);
  
  console.log('numItems: ', numItems);

  items.forEach((item, i) => {
    const arm = document.createElement('div');

    arm.style.setProperty('--index', i+1);
    
    
    let svg;


    if(i == ((numItems + 1) / 2 ) - 1) {
      svg = getFlatSvg();
      arm.classList.add('middle');
    } else if(i > numItems / 2 - 1) {
      svg = getCurveSvg();
      arm.classList.add('bottom');
    } else {
      svg = getCurveSvg();
    }
    
      arm.appendChild(svg);

     item.prepend(arm); 
  });  
});

function getCurveSvg() {
  const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
 // viewBox="0 0 100 100" preserveAspectRatio="none"
  svg.setAttribute('viewBox', "0 0 100 100");
  svg.setAttribute('preserveAspectRatio', "none");
  
  
  const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
  
  path.setAttribute('vector-effect', 'non-scaling-stroke');
  path.setAttribute('d', 'm 0 4 C 80 2, 40 96, 100 98');
  
  svg.appendChild(path);
  
  return svg;
}


function getFlatSvg() {
  const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
 // viewBox="0 0 100 100" preserveAspectRatio="none"
  svg.setAttribute('viewBox', "0 0 100 100");
  svg.setAttribute('preserveAspectRatio', "none");
  
  
  const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
  
  path.setAttribute('vector-effect', 'non-scaling-stroke');
  path.setAttribute('d', 'm 0 4 h 100');
  
  svg.appendChild(path);
  
  return svg;
}

style.css

:root {
  --bg-color: hotpink;
  --fg-color: white;
  
  --item-vertical-padding: .25em;
  --item-vertical-margin: .5em;
/*   font-size: 12px; */
}


body {
  font-family: system-ui, sans-serif;
  font-weight: normal;  
}

.container {
  color: var(--fg-color);
  display: grid;
  width: 80%;
  border: 1px grey solid;
  grid-template-columns: 2fr 1fr 2fr;
  align-items: center;
  line-height: 1
}

.items {
  margin: 0;
  padding: 0;
  list-style: none;
  position: relative;
}

.items li {
  background-color: var(--bg-color);
  margin: var(--item-vertical-margin) 0 var(--item-vertical-margin) 0.5em;
  padding: var(--item-vertical-padding) 0.5em;
  border-radius: 0.5em;
  width: calc(50% - 1em);
}

.items li div {
  position: absolute;
  z-index: -1;
/*   background-color: rgba(0, 255, 0, 0.5); */
  height: calc(
    50% - 
    (
      (var(--index) - 1) * (var(--item-vertical-padding) * 2)
    ) - 
    (
      (var(--index) - 1) * (var(--item-vertical-margin) * 1)
    ) - 
    (
      (var(--index) - 1) * 1em
    ) + var(--item-vertical-padding)
  );
  right: -1em;
  width: calc(50% + 2em);
  margin-top: calc(-1 * (var(--item-vertical-padding)));
  padding-block: calc(var(--item-vertical-padding) + 0.5em);
  padding-block: 0.5em;
}

.items li div.bottom {
/*   background-color: blue; */
/*   background-color: rgba(0, 255, 0, 0.5); */
  height: calc(
    50% - 
    (
      (var(--itemCount) - var(--index) + 0) * (var(--item-vertical-padding) * 2)
    ) - 
    (
      (var(--itemCount) - var(--index) + 0) * (var(--item-vertical-margin) * 1)
    ) - 
    (
      (var(--itemCount) - var(--index) + 0) * 1em
    ) - var(--item-vertical-padding)
  );  
  top: 50%;
/*   left: calc(var(--index) * 1em); */
  margin-top: calc(-1 * (var(--item-vertical-padding)));  
}
.items li div.middle {
  top: auto;
  bottom: initial;
  margin-top: 0;
}

.items li div.middle svg {
  height: 1em;
}

.items li div.bottom svg {
  transform: scaleY(-1);
}

.items li div svg {
  width: 100%;
  height: calc(100% - 1em);
  overflow: visible;
}

.items li div svg path {
  stroke: hotpink;
  fill: transparent;
  stroke-width: 10;  
}

.items.out li {
  margin:  0.5em 0.5em 0.5em 0;  
}

.head {
  background-color: var(--bg-color);
  aspect-ratio: 1;
  width: 100%;
  border-radius: 50%;
  text-align: center;
  display: flex;
  justify-content: center;
  flex-direction: column;
}